```baml {3, 12-16}
class DynamicClass {
    static_prop string
    @@dynamic
}

function ReturnDynamicClass(input: string) -> DynamicClass {
    // ...
}

test DynamicClassTest {
    functions [ReturnDynamicClass]
    type_builder {
        dynamic class DynamicClass {
            new_prop_here string
        }
    }
    args {
        input "test data"
    }
}
```
